<template>
    <div class="todo-footer"  v-show="total">
        <label>
          <!-- <input type="checkbox" :checked="allDone" @change="checkAll"/> -->
          <input type="checkbox" v-model="isAll"/>
        </label>
        <span>
          <span>已完成{{ doneTotal }}</span> / 全部{{ total }}
        </span>
        <button class="btn btn-danger" @click="clearAllDone">清除已完成任务</button>
    </div>
</template>

<script>
export default {
    name: 'MyFooter',
    props:['todoS'],
    computed:{
        /* doneTotal(){
            return this.todoS.filter(item => item.done).length;
        } */
       /* doneTotal(){
            var count = 0;
            for(var i=0;i<this.todoS.length;i++){
                if(this.todoS[i].done){
                    count++;
                }
            }
            return count;
        }  */
       doneTotal(){
        /* const totol = this.todoS.reduce((pre, current) =>{
            console.log(pre, current)
            return pre + (current.done? 1 : 0)
        }, 0)
        return totol; */
          return this.todoS.reduce((pre, current) =>  {
                console.log(pre, current)
                return pre + (current.done? 1 : 0)
           }, 0)
       },
       total(){
           return this.todoS.length;
       },
       allDone(){
            return this.total === this.doneTotal && this.total > 0;
       },
       isAll: {
            get() {
                return this.total === this.doneTotal && this.total > 0;
            },
            set(val) {
                this.$emit('selectAllTodo', val);
            }
       }
    },
    methods:{
        checkAll(event){
            var checked = event.target.checked;
            this.$emit('selectAllTodo', checked);
        },
        clearAllDone(){
            this.$emit('clearDone');
        }
    }
}
</script>

<style scoped>
    

    /*footer*/
    .todo-footer {
        height: 40px;
        line-height: 40px;
        padding-left: 6px;
        margin-top: 5px;
    }

    .todo-footer label {
        display: inline-block;
        margin-right: 20px;
        cursor: pointer;
    }

    .todo-footer label input {
        position: relative;
        top: -1px;
        vertical-align: middle;
        margin-right: 5px;
    }

    .todo-footer button {
        float: right;
        margin-top: 5px;
    }
</style>